Active and Passive Electric Potential CT (Computer Tomography) Methods for Identification of Defect in Inhomogeneous and Anisotropic Materials

用于识别非均匀和各向异性材料缺陷的主动和被动电位 CT（计算机断层扫描）方法

基本信息

批准号：
10555030
负责人：
KUBO Shiro
金额：
$ 7.36万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

The present study deals with the extension of the electric potential CT method proposed by the present investigators for the identification of a crack in a homogeneous isotropic body. The major results obtained are summarized as follows.1. The method was made applicable to the identification of a crack in a non-homogeneous body and in an anisotropic body. by considering inhomogeneity and anisotropy in the electric potential calculations using the boundary element method. The method was applied to the identification of an interface crack in bonded dissimilar materials Numerical simulations and experiments showed that the extended method was useful for the identification of the interface crack.2. The method was also applied to the identification of delamination in anisotropic material. The anisotropy was taken into account in the boundary element calculations of the electric potential distribution. The method was applied to the identification of delamination in carbon fiber reinforced layered composite materials. Numerical simulations showed the applicability of the method.3. The electric potential CT method proposed so far is classified into an active method since the method uses the electric potential distribution under an application of electric current. A passive electric potential CT method, which did not require current application, was proposed by adhering piezoelectric film on the surface of the cracked body and measuring the electric potential on the surface. The effect of location and size on the electric potential distribution were examined. It was found from numerical simulations and experiments that the crack location and size can be estimated from the electric potential distribution on the piezoelectric film.

本研究涉及本研究人员提出的电势CT方法的扩展，以鉴定均匀的各向同性体内的裂纹。获得的主要结果总结如下1。该方法适用于鉴定非均匀体和各向异性体内的裂纹。通过考虑使用边界元素方法在电势计算中考虑不均匀性和各向异性。该方法应用于键合材料数值模拟中界面裂纹的识别，实验表明该扩展方法对于识别界面裂纹很有用。2。该方法还应用于各向异性材料中分层的鉴定。在电势分布的边界要素计算中考虑了各向异性。该方法应用于碳纤维增强分层复合材料中分层的鉴定。数值模拟显示了该方法的适用性3。到目前为止，提出的电势CT方法分类为有源方法，因为该方法在电流的应用下使用电势分布。提出了一种无需当前应用的被动电势CT方法，它是通过在破裂的身体表面上粘附的压电膜并测量表面上的电势来提出的。检查了位置和大小对电势分布的影响。从数值模拟和实验中发现，可以从压电膜上的电势分布估算裂纹位置和大小。